A May 24 wedding is being planned by Ashley Vancheri and Sean Tosadori, both of Mars. The bride-to-be is the daughter of Peter and Robin Vancheri of Mars. Parents of the prospective bridegroom are Keith and Cheryl Tosadori of Butler. The bride-elect is a 2004 graduate of Mars High School and a 2008 graduate of Penn State. She is a teacher at Mars High School. Her fiancÚ graduated in 2005 from Butler High School, and in 2009 he graduated from Penn State Behrend, The Erie College. He is employed by Petroleum Technical Services in Prospect.